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首页> 外文期刊>Ocean Engineering >Experimental investigation and analysis of hydrodynamic characteristics of a net panel oscillating in water
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Experimental investigation and analysis of hydrodynamic characteristics of a net panel oscillating in water

机译：网状板在水中振荡的水动力特性实验研究与分析

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摘要

To investigate the behaviour and hydrodynamic characteristics of supple nets in a wave, experiments of forced oscillation were conducted in a tank with square net panels. The four corners of the net panel were fixed to the oscillation device with a specific pretension. The hydrodynamic loads acting on the corners of the netting were measured. To simulate the experiments, a numerical model based on dynamic finite element analysis was constructed. Comparing the amplitude and phase of measured loads with the calculated results, the drag coefficient Cd and inertia coefficient Cm were determined by interpolation and iteration. The effects of various parameters on Cd and Cm were investigated. The results show that: (1) drag force is dominant at low frequency, whereas the contribution of inertia force increases with an increase of the Keulegan-Carpenter number or frequency; (2) with increasing frequency, both Cd and Cm show a decreasing trend, and the trend of Cd against the Reynolds number is similar to that in steady flow; (3) increasing oscillation amplitude makes Cd decrease, but it has no significant effect on Cm; (4) solidity generally has a positive effect on Cd and Cm.
机译：为了研究波浪状柔网的行为和流体力学特性，在带有方形网板的水箱中进行了强迫振荡实验。网板的四个角以特定的预紧力固定在振动装置上。测量作用在网角上的流体动力载荷。为了模拟实验，建立了基于动态有限元分析的数值模型。将实测载荷的振幅和相位与计算结果进行比较，通过插值和迭代确定阻力系数Cd和惯性系数Cm。研究了各种参数对Cd和Cm的影响。结果表明：（1）低频时拖曳力占主导，而惯性力的贡献随着Keulegan-Carpenter数或频率的增加而增加； （2）随着频率的增加，Cd和Cm均呈下降趋势，Cd相对于雷诺数的趋势与稳流相似。 （3）增大振荡幅度使Cd减小，但对Cm无明显影响。 （4）坚实度通常会对Cd和Cm产生积极影响。

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